diff --git a/hyper.h b/hyper.h
index d8cc636a..208d95c8 100644
--- a/hyper.h
+++ b/hyper.h
@@ -3158,6 +3158,7 @@ struct supersaver {
   virtual void load(const string& s) = 0;
   virtual bool dosave() = 0;
   virtual void reset() = 0;
+  virtual ~supersaver() {};
   };
 
 typedef vector<shared_ptr<supersaver>> saverlist;